docs: def service_restarted(self, sentry_unit, service, filename,
                            pgrep_full=None, sleep_time=20):
          """Check if service was restarted.
  
             Compare a service's start time vs a file's last modification time
             (such as a config file for that service) to determine if the service
             has been restarted.
             """
          # /!\ DEPRECATION WARNING (beisner):
          # This method is prone to races in that no before-time is known.
          # Use validate_service_config_changed instead.
  
          # NOTE(beisner) pgrep_full is no longer implemented, as pidof is now
          # used instead of pgrep.  pgrep_full is still passed through to ensure
          # deprecation WARNS.  lp1474030
          self.log.warn('DEPRECATION WARNING:  use '
                        'validate_service_config_changed instead of '
                        'service_restarted due to known races.')
  
          time.sleep(sleep_time)
          if (self._get_proc_start_time(sentry_unit, service, pgrep_full) >=
                  self._get_file_mtime(sentry_unit, filename)):
              return True
          else:
              return False